Version 0.9.8.3

HOTFIX

This patch includes a number of minor bug fixes:

• Fixed the issue of weird ('*',) line labels in circuit construction routines when used with multi-qubit notation circuits, e.g. (0,)-labeled circuits getting erroneous ('*',0)-labeled circuits created.
• Fixed bug in optools.fidelity for special case of trace-reducing rank-1 ops.
• Now handling sqrtm failure in optools._hack_sqrt as a warning instead of assertion error.